/*
 *  Pager Tag Library
 *
 *  Copyright (C) 2002  James Klicman <james@jsptags.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package top.melody.ecommerce.common.jsptags.pager;


import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;

public abstract class JumpTagSupport extends PageTagSupport {

    static final String CURRENT = "current",INDEXED = "indexed";

    private String unless = null;

    public final void setUnless(String value) throws JspException {
        if (!(value == null || CURRENT.equals(value) || INDEXED.equals(value))) {
            throw new JspTagException("value for attribute \"unless\" " +
                    "must be either \"current\" or \"indexed\".");
        }
        unless = value;
    }

    public final String getUnless() {
        return unless;
    }

    public int doStartTag() throws JspException {
        super.doStartTag();

        int jumpPage = getJumpPage();

        if (CURRENT.equals(unless)) {
            if (jumpPage == pagerTag.getPageNumber())
                return SKIP_BODY;
        } else if (INDEXED.equals(unless)) {
            int firstPage = pagerTag.getFirstIndexPage();
            int lastPage = pagerTag.getLastIndexPage(firstPage);

            if (jumpPage >= firstPage && jumpPage <= lastPage)
                return SKIP_BODY;
        }

        setPageAttributes(jumpPage);

        return EVAL_BODY_INCLUDE;
    }

    public void release() {
        unless = null;
        super.release();
    }

    protected abstract int getJumpPage();
}

/* vim:set ts=4 sw=4: */
